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The 31-year-old, who can also play at left-back, has never represented his country, although he has lined up alongside the likes of Manuel Neuer, Jerome Boateng, Toni Kroos and Mesut Ozil for the Under-21 side between 2007 and 2009.

Heller, who won two consecutive promotions with Darmstadt, played 34 games in all competitions last season and netted four goals for Die Lilien.